Game update roll-back or something

Recruit - Bronze

I've just player a few games recently and it seems almost stuck in an old update or something, there are 2 elites in a ranger squad and rangers still drop from spirit drop at 3 vet, the pelican gunship is worthless again, I haven't tried to play online but when I tried to cross-play with my friend (I'm on PC) it would disconnect the "Halo Wars 2 Online Service" for a second which would make him unable to join and when I just joined his game it said "Different game version to host", I'm really confused. It must have something to do with that big 12 gig update but i'm not 100% sure. Is this a common issue? Should I just reinstall the game?